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Why are potassium and caesium rather tha...

Why are potassium and caesium rather than lithium used in photoelectric cells ?

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Because they show property of photoelectric effect.
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AAKASH INSTITUTE ENGLISH-THE S-BLOCK ELEMENTS-Try Yourself
  1. What colour is imparted by Rubidium in flame test?

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  2. Which alkali metal do not show photoelectric effect?

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  3. Why are potassium and caesium rather than lithium used in photoelectri...

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  4. What do metal oxides form when they react with water?

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  5. K, Rb and Cs form mainly superoxides.

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  6. Which compound is formed when lithium reacts directly with nitrogen in...

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  7. What is electrode potential?

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  8. If an element has more negative value of electrode potential, then wha...

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  9. Apart from water, alkali metals react with which kind of compounds?

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  10. Mention the important properties of saline hydrides

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  11. Except for lithium, alkali metals form their hydrides at what temperat...

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  12. Why are lithium halides partially covalent ? Explain with examples.

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  13. Among the alkali metals, which element has the highest reducing power...

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  14. If standard electrode potential of an element x is -1.70V and of anoth...

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  15. The alkali metals dissolve in ammonia to give a deep blue solution whi...

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  16. Why is the solution of an alkali metal in ammonia blue?

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  17. The blue coloured solution is diamagnetic or paramagnetic?

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  18. The bronze coloured solution is diamagnetic or paramagnetic?

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  19. What kind of oxides are formed by sodium?

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  20. What is the trend of enthalpy of formation of alkali metal fluoride?

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